CIESC Journal ›› 2017, Vol. 68 ›› Issue (2): 612-620.DOI: 10.11949/j.issn.0438-1157.20160302

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Characterization of flow regime transition in gas-solid fluidized bed by recurrence quantification analysis of acoustic emission signals

HU Dongfang1, HAN Guodong2, HUANG Zhengliang1, WANG Jingdai1, YANG Yongrong1   

  1. 1. State Key Laboratory of Chemical Engineering, College of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China;
    2. Ethylene Plant of Tianjin Petroleum Chemical Corporation, SINOPEC, Tianjin 300270, China
  • Received:2016-03-17 Revised:2016-04-20 Online:2017-02-05 Published:2017-02-05
  • Supported by:

    supported by the National Natural Science Foundation of China (21406194, 91434205), the National Science Fund for Distinguished Young Scholars of China(21525627), the Natural Science Foundation of Zhejiang Province (LR14B060001), the Specialized Research Fund for the Doctoral Program of Higher Education of China (20130101110063) and the Fund for State Key Laboratory of Chemical Engineering(SKL-ChE-13T03).

基于声发射信号递归分析的气固流化床流型转变

胡东芳1, 韩国栋2, 黄正梁1, 王靖岱1, 阳永荣1   

  1. 1. 化学工程联合国家重点实验室, 浙江大学化学工程与生物工程学院, 浙江 杭州 310027;
    2. 中国石油化工股份有限公司天津分公司烯烃部, 天津 300270
  • 通讯作者: 黄正梁
  • 基金资助:

    国家自然科学基金项目(21406194,91434205);国家杰出青年科学基金项目(21525627);浙江省杰出青年科学基金项目(LR14B060001);高等学校博士学科点专项科研基金项目(20130101110063);化学工程联合国家重点实验室基金项目(SKL-ChE-13T03)。

Abstract:

The acoustic emission (AE) signal characteristics were measured under different inlet gas velocity of gas solid fluidized bed. The hydrodynamics of the bed and the transition velocity from bubbling to turbulent fluidization were investigated by acoustic energy and recurrence quantification analysis (RQA). Because the acoustic energy analysis could not distinguish the regime transition velocity at different bed height, RQA was further applied to analysis the acoustic signals due to its ability to predict periodicity of a system. The results of RQA indicated that the motion of solids was more periodic when the bed was at the bubble regime compared to the turbulent regime. And the transition velocity of the solids at the lower bed height calculated by RQA was higher than that at the higher bed height. Therefore, the acoustic emission technique based on RQA should be an effective way to monitor the transition of flow regimes in the gas-solid fluidized bed and indicate the process of regime transition at different bed heights.

Key words: fluidized bed, transition, acoustic emission, measurement, recurrence analysis

摘要:

利用声发射技术采集不同流化气速下流化床内颗粒与壁面碰撞的声信号,结合声能量及递归分析法研究不同流型下颗粒运动特征,得到鼓泡流态化到湍动流态化的临界转变速度及流型转变规律。特别是针对声能量分析无法准确区分不同床层高度处流型转变的不足,利用递归分析可有效预测系统周期性的特点,将声信号进行递归分析,研究了流化床不同位置的流型转变性质。结果表明,鼓泡流态化下颗粒运动的周期性较湍动流态化强,并能够清晰地检测到由鼓泡流态化向湍动流态化的流型转变速度,而且床层较低处的流型转变速度比床层较高处大。由此获得了一种便捷灵敏、安全环保的非侵入式流化床流型转变速度的测量技术,可用于对整个流化床内不同位置流型转变过程的实时在线监控。

关键词: 流化床, 过渡, 声发射, 测量, 递归分析

CLC Number: